using System;

using System.Collections.Generic;

using System.Linq;

​

public class Book{

    int _id;

    public int ID{ 

        get{ return _id; } 

        set{ _id = value; } 

    }

    public Book(int ID){

        _id = ID;

    }

}

​

public class Program

{

    public static void Main()

            {

        Console.WriteLine("Hello ToList FindAll");

        int[] x =  {21, 22, 32, 11, 12,  33, 44, 45 };

        List<Book> b = new List<Book>();

        List<int> w = (x.ToList<int>()).FindAll(f => ((f> 10) && (f < 30))); //(f.Exists(n => ((n > 10) && (n < 30)))));

        Console.WriteLine(" w0 " + w.Count());

        for(int i = 0; i < w.Count; i++){

            Console.WriteLine(" w1 " + w[ i ]);

        }

        w.Sort();

        for(int i = 0; i < w.Count; i++){

            Console.WriteLine(" w2 " + w[ i ]);

        }

        for(int i = 0; i < x.Length; i++){

            b.Add( new Book(x[ i ]));       

        }

        //b.FindAll(f =>  )).ToList<Book>();

        Console.WriteLine("books " + b.Count);

    }

}